Top stopped cooling, but freezer on bottom works fine. had some problem maintaining temp for last couple of weeks. do you think it is a fan or something more serious?

<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 'Trebuchet MS'; FONT-SIZE: 10pt; mso-ansi-language: EN" lang=EN>Hi,<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></P><P style="MARGIN: 0in 0in 0pt" class=MsoNormal><SPAN style="FONT-FAMILY: 'Trebuchet MS'; FONT-SIZE: 10pt; mso-ansi-language: EN" lang=EN><BR>Check out these tips...they can help you figure out whats going wrong with your refrigerator and why it is not cooling<BR><BR>Refrigerator not Cooling or Fridge not Cooling<BR><A rel='nofollow' href="http://www.fixya.com/support/r3662945-refrigerator_not_cooling_or_fridge_not" target=_blank><FONT color=#0033cc>http://www.fixya.com/support/r3662945-refrigerator_not_cooling_or_fridge_not</FONT></A><BR><BR>How to Defrost Refrigerator Defrost Timer Problem <BR><A rel='nofollow' href="http://www.fixya.com/support/r3771673-defrost_refrigerator_defrost_timer" target=_blank><FONT color=#0033cc>http://www.fixya.com/support/r3771673-defrost_refrigerator_defrost_timer</FONT></A><BR><BR><BR>Water Running in efrigerator from Freezer<BR><A rel='nofollow' href="http://www.fixya.com/support/r3780310-water_running_in_refrigerator_from" target=_blank><FONT color=#800080>http://www.fixya.com/support/r3780310-water_running_in_refrigerator_from</FONT></A><BR><BR>heatman101<o:p></o:p></SPAN></P><P style="MARGIN: 0in 0in 0pt" class=MsoNormal><o:p><FONT size=3 face="Times New Roman">&nbsp;</FONT></o:p></P>